SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9cf04320cf18989586f0ed9722e881f4d456258033577fdf9b7da2f971e2887' 
  AND token = 'p5SuzCTYgmR+wAL9qy/U5WprfNwpkRvseWLx/qyC8wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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