SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed8e85b2fa40711502784234000bace26ad285a1296da7ce20b660d6d8c6782b' 
  AND token = 'n9YKQnbs5xxd+KBNYRQ+zmaJ3vYfbuU0kfUo5KZpGew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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