SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df5c22b48844658e6e69f68ac657b2b8efb7e675cd5fad30222a418cfb742099' 
  AND token = 'keFOGxw7i2zKg1VXVZNZCEH4M1/o+TZ7Dd6PTA5HwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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