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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db8ead619bc8290b53ab8d9337a645e4e392c92c0056cfd3bbf2f145ca829cc8' 
  AND token = 'G+/1aQHP4XUaVcKt5dzpgNB6SW58/d7Nucx2EzC7vN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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