Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04e35b9380ccd9c0573c62c1d5ac7e50462cb3539187aa31d2811ee02d6cb5ad' 
  AND token = 'H4WoD/bYqfBXRGptVNSUyNkSk0JMB+d8o6jTBBmHcYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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