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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1187f9fc28e3fd33660f5820cfb47df330c6594ef554b58a8ddc125a3454698f' 
  AND token = 'Imy8nUo1R+dKlluL75tGYSDJ88Ff68i19DCfzeQWqMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}