SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84348366813c410ae815d697a0ce1cf57f3b95161fd60014e9ffaa5d9985e9eb' 
  AND token = 'twq8k1PFEaAzCiiOYvExi94x4B0SddZeGJg+ZLjlQK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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