SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e78c5a7c02efe1964f2dd988ac62790aeac1ba1ac8c25539268587866aa6ce59' 
  AND token = '9F4BnY4jIXzZ+sUCOGpz5iQzROlr4gx4Twljc9KimqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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