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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a70e5aea6444c6fe5e74647e582c464367a5d48fbc6f0d5d533c11db306daec3' 
  AND token = 'zxzafEfOiAw9heqd/jrpSJskhiO7Hx0KqOt8jkFBYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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