SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '963a79facad7abc479b55541f8e0891d8b55d1e48abab914be78a9c2653bc55a' 
  AND token = '8KWVi+lIJKxw49Kszjoy6cxWhH6GxgudKhRfYBjNWIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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