SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '698859752fb23f9144b2cf9f473eece6587ac8b35c44dda70228b69069b8cdb9' 
  AND token = '91ZgT+s8OGYYDy0tnP8YlA/wj24dP+TFzoAXZdYb6Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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