SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70bc9ec70354049ee1f965de3f3025379fda10bcce97344aa3cf50e8e294ba6b' 
  AND token = 'h2nZHRjTABmGyswjzt5Cmb4AObUUgYQGkgY4jC+g+LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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