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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b01688aa069e934069365f568e5c46b948c32f3e02abeb593a0ba3cf8b6cf01f' 
  AND token = 'oAseT7lAtohaSQAMcFzE+CS2WUTQQS1l1nQlfkeqgKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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