SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37b5d2555a119fbeaa4db5cd5c29fdcb3345727475831512fb789ee5a6c6189f' 
  AND token = 'blhfh6jOkVGxEKVjwKaooZSOV0L9EUwwBBQ6SveZFfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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