SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4179ec2469d69efd1e30a927cd8aacf6a631b55fb4eb95be8e13a758fa52caa5' 
  AND token = 'xM3BtgszzAwVhJcsnM2q06KgRRKlIPGOpkkjl7SnZwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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