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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '220913456f216057fde0d929175f103dec3c1a8266aeab0e0bbdfdd268a6c8f4' 
  AND token = 'WGMsal4gttY87NWrdt9uoKrphUUrU2qfUuGGLar8C7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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