SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08a8a0ea1ce6fbf3a428465603731ba184473f0bfb0198b4ed95561d01040f52' 
  AND token = 'hjN2/Dvn9ar6G5jqKu42QpaoXDmJXXIgZ5/kdXZKXgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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