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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5811607854f7f323d183e029bd7d620ed8e4240d3cbbc86547f6f8aa77de4d2' 
  AND token = 'st46l4LraqRZpfT0Uli5k7ikcGPP0MvM4QLzm5MiqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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