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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb175e7c677b925266b07bb423d91cff9c1acf1c8d84b03576f79ed33b70a2e' 
  AND token = 'Ifd0fqUaesXIZUiaNPGRi50K4pKSIoZXd3ub4vQhv0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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