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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd31dd4ee24f4cc03cb64aa0f4058e38cf00db672125f7502da15c75629d37ef1' 
  AND token = 'gYMq0nbTqwN+lxGpSbYvxeuu7O6Sk4/ngdKSzqNN8po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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