Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1b267b5a2b022fb2c0791312ec4d7a4d30906eff616224b3134d92c1af04bf0' 
  AND token = 'ZiWp9ENVqepr+XdM41MmT1zKQaMUF2DmTgi8tenjZN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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