SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '377bf43bba6953b64d20b27834857950bd895d3a8f53e3947901f508842ab625' 
  AND token = 'kT+REVuiqOR4bj9MG5FY6qPHgZpUzJsPO3zIa4VhX1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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