SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd92f18e66030a11180fe57c3c4786fa069ffe821e72672e114cd53d717033ca' 
  AND token = 'ZUzU6KOObkLIkgkOPhgmfShK8gn1tvPl/ds5vgC/mXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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