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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27a31595b765915e9430f3f9d3c79aa22153240682413a68309ce3559ae74dc6' 
  AND token = 'dhR+np2rTSvZaW0ZwcFyFCFLZHi8Mc2TjcgsvZVHl6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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