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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4672d95494c29b8c96e4eeaa15565787884f868cdbcf49dbf9d77546518f850' 
  AND token = 'XTbBipENOk5O6w9RfIdKbs/te0/TJ5uWd9s7aAkgzyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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