SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ef034116680b1cd92172734c68156334cc7d2012451355a5a60e068f1c943c9' 
  AND token = '+AR4PEJXlCz1sXB28QvjGgFHEZIGgaTM7eMKqR+vQGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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