SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bc18c4d529b99a502a3e5b6195b4b474d0206afd78d4f0226e6bdb551c7b5eb' 
  AND token = 'GmqRoJ89Hz9qcR7VNvNf2zl7gJ+CIscNsZlVj5Dz8B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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