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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c23da34fac5cb35972c1d50755b7040a6f4e1f5d74f7ff5fb1b6c0a2d9971be' 
  AND token = 'N7H4ub5iEkZ0XAf18KD3bU3S6Lafu10AxzFB1qA+i+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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