SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7966f8d8734236ff9841c558cb96042f5224134d75b6d87756bff28aeca9937' 
  AND token = '6fMHv9uOwj1N6Il0U7XAKLcYKfsB2qDwd1mZE7dHhTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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