SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db0be8b37e1a663df59e5a554a0eb1587d386bf7f8e90ba23532ff8fe25c419' 
  AND token = 'SMKdNBHvuUeRYYCfePr/heub2lETOGlp+gJY5lyVEtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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