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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e01c2d1b2ad348a1228f23320aaccb8f684bee9d59fd5532c9495fb62ba99825' 
  AND token = 'iEA7P4+YluzFMUJTfKrD23cjc9KmAFJynGGo6ZceWoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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