SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '773642ee591451ba2def7d9b73a90a4c84ad6b9c92b53267399abcce7d1b5a73' 
  AND token = 'gBS4xF9ZJmhquQjKw1lmP3I8RPe8qzir35bZ6QZL0z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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