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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '836830a91ea47c21f5df11304c9d3fcb9e8c6948be2659450c996e1bb2d2f5a4' 
  AND token = '4viV1lpN8oRIBbDwBQN4InB05Z0gyidEinikvaxxc4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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