Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bc19c835527d3566d339f3cf308c78d3862fe994b53dc1b1d9a16fa91ceda6d' 
  AND token = 'mejOBs+dOau20HOET19qZX61wqCQ4CfkJpTeLkMnkao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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