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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3636d8def592c1076b1101cd44ca0eb66056a1ebe23f4285bfb0698d9603a899' 
  AND token = 'M74W5hTI1yxzCQj6tQn+0xqjOVNahsICAT6KrBcOKw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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