SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbd9dd95e50e7f2d27a9364d14e8dfcf40923207ad52b816eacd8b71a060b929' 
  AND token = 'IbzE26suKuDavK88ZqbXHRvEFDpuTOUZLwJ+SqUF0D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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