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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16ad939dc13a7cb5d2212022ff1c7146f9e36921a6a58868ed3831a285dc1f5a' 
  AND token = 'TBfD28zxIMRITKeVNCX80U3e3PZbXY8/m7KMEI9yGk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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