SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75af2442c738ffb365773a98e80ee725a7d0206e22b4e71636db26c69289654b' 
  AND token = 'FrZtVBfbUOZX7XoJu+OMPpMX2EYgsW+5ZW2l3pq4qYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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