SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34e0bfb5311c0dd28e07228ac262710865e0001194ad6475b093b0fba6ed8e21' 
  AND token = 'qVxwhPKfDw6Ygp/xCmlwGDpJtlUAGNnQMwAdCUnTDOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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