SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4013023b2f27071c181ee8213e2f858fbb6add798a20f08b6012a9510913de96' 
  AND token = 'XDabAhYIIrAJI7BVUmVMElcmHbuja0viPzchOE/qNqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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