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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aced4c5cef7194cd519ac175cc9858fc052f37067fe546db30bad96d6b1ea70b' 
  AND token = '7z/Pl+9Ho4BI9IlD+7ag2+LnxVFc59gk8mbk+F5X3rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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