SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0890720597d7162badad7711415f9bf0bb02e8e5610858045ad59366ab37d84' 
  AND token = 'JaCHkAyUKnqtixsGI7ZdLAG2DV9NuQAMbQZ4lC9VjDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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