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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61139910a9d5ea4c976b11bca4124e54e956ab0c7cc8fb48c8ac529fafb5a12b' 
  AND token = 'EdIp0HOnlfWr0GQB87PQN4psSNLFKlNqqe9yxiJiC1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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