SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac6319081bdf50f7237fe506d1179afac2ed9e4a9e2cf1bf6088b52ebe708ac' 
  AND token = 'Y+mBsqvheVVjkxykd5VLqhWau0ZmzrORJQor39WGLbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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