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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18be7250dd2cb2b905c041e895cc7e410a5fb6f66a820603b56ced53f0917bb2' 
  AND token = '2UTQMFUZnyGUUs8bXLH5sInTL8e1YCOP8k3XPmJzG/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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