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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2056f80109147a4994143ad3373cbeaeb8b8bbd6f07c5c332cb50fdda126abc6' 
  AND token = 'MQ5KcEifvsaZ06h7XlDUl3k6U+qj4xlmNLG9af33RTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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