SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f6c3102c280ec8d5f35999b92a4029e29e120c04f8731f4f3b29ae46fbb178a' 
  AND token = '5qticHwQmKiq+LtZR/ebaYwAvm4hq687RcpmVbUZIY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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