SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d58258293fb31fd2d23195f23e8c5c7af9488169ad259b012430a9989691fef' 
  AND token = 'xnLLWVnjqtyRC9gxfWz8oVUU71gLgRcJUgfDRBKGVQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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