SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7714f3baafb29ae9998438102843015103cb196bc286b3103ff5f754a7f05a65' 
  AND token = 'hz5daCAjNHuQix6L1gw7RXoBBKhQ3NnJ/trYvr0rSOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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