SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f5667a8b101b4a005cd19057507f6a67d87405dd37cad0ab91708fdfc17efb6' 
  AND token = 'r+co9q99upSufcVZewPJqyJYrAZ1P15BKxjQH6hOIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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