Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6b0b2f228eea5d58f19d3c4f8f26cb032bfc38a490ab0eab7a4d941aaff61db' 
  AND token = 'LRa1wWOUdQLyl3D/ca+OwHFnk2fYtqzSsoRYdmWgWM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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