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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb5b6f8d2a9d8691610a72721ec0a6e1e3df0d252972bd61dc4add83180b420c' 
  AND token = 'Eigh2zOsTXmXupHtGQ38EA3t2VTT5OEDX/M4HoLkOq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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