SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '726dad609d44428147cdbdea1db41cfdb52fe27aa6eb8299f81fd9cfff469594' 
  AND token = 'AQg0yCl943aim+BYrPIvBnZYC0mXD5g/htzBGt1ooi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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