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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b326b1be3c78a95e1337cab5cb25276638a9d9ba07f1f8cfee212d9f1b812507' 
  AND token = 'YRlHxHw8aflBe1exQ5f97UEJqp/4Jc43JGSHfLGg+/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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