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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95a507d8074a40f2ce549e33a7fed0354921d1075a7388eeca73ad25ab938029' 
  AND token = 'w5ATSIJxgPRb9uXquelZaoqrrzoaWrKSy7pPyINtBwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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