Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54f402e4f639fc051a45c47be3993c0d0a3f60c1621ac8f9cd53e9d6ea8c1641' 
  AND token = '88tXOFZMP01qccaEa39Mw1m83E/dBoLU+EDsEOkSQ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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