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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4b35acf0d0f749717c3605328e111505e55b69e73c1cb65ff1830615575cb50' 
  AND token = 'pjSWXA7dAF9I63WS6nGG3hjZGamq1HqyhvqZnNkRXrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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