Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aebc73a4d08bfaea8e2c8de53cb0e52e73f9f99297ac18b21ff1ee5835b2d977' 
  AND token = 'WgjpZX9y8XEe8z3sT+NinCWokzyGkgnTzECks2wiKgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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