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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '305528c703294be795acb469a16e40f690805935377ab2a24e30ed3ec3254dd7' 
  AND token = 'l0aRXFvQJKQ6tjK3ZfCFsNgvPty5RInppKvtqQXdk9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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