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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25c16a8e28cd0ab6676c6d77aad7010fb01414bb714a4b1205faa8ed2cc3af23' 
  AND token = 'bmcRjwwjSwf55vUvVoReFCY5A74Uod1XFZnt+FsmpoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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