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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53643f4d3d2e4bc7df05b756d8f3905338d2ef06c9af9df60fbb75d13e5ad8fc' 
  AND token = '3ksoSi+IHJPr8g6PGcCTKGkcU2RrWlKcyTkAEk3Oz18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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