SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e23f2a95a54d6c7c85fadff764a6eeb2cb109db35fde1df2388922f6df9ea90' 
  AND token = 'BWnqs5yQpvs3Bu+0p+kZyxOLwsGe/YvADGljo4uwytE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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