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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24b3806f0af26597d60a1f54e4abd5a1ef63893bf512ee3bbe52ff8cd5fb28db' 
  AND token = 'SGnZ9zqHG0CTBLV0SyDr6qH0j28PEBxd3lEezUFnqOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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