SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7042d656b6be4fa9b39123c70ece12ebdb665318c891473f9d7200be39d2a6e5' 
  AND token = 'OVkZifhJYXTRJXDRC6wDHZ1aL1Ely8F1hISpZgvc0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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