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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3beb8309c554fab3da39c572ca214f6d3d4cb1d28d0cfa08b8d5bf0de9f51577' 
  AND token = '3Fnh/UH67GBCeWjTHOTZapsnfeBeNd8q9bq/ROGenpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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