SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4309e31b66276a930d566d328713a379f7f954d3e8b423cd5f18e16ecb4d5050' 
  AND token = '1Z0dOXOIPjjfuxBqAUHELtjChvXHyMZ3M6cvIuzY8OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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