SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96991f8c38386b70dc5181a878bc159def81d738a6b0da882203261b2069df00' 
  AND token = 'wZuArvoMf0M9MpUq5BFnEUZXJwgoqX+kqZrb1wfKsVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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