SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40ff23ad9cfeda08ac4639bb3191005748627cef3a16999cb8f1c2f0f5b277e4' 
  AND token = 'zqecYV+qmBXGc8/nxL2g1MSdEpxR4DU8JrhcGZ/Pv7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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