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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cffa603e6f4a9987a316c331887b2fd2bf3a28bb7733dbbd58191d4eaa09b5f' 
  AND token = 'NY0GlNQG1kolfJdxfmx49wbYNHRKeFk2BKRhFO7eL2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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