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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '170f6eda45be3e11407be41a4f7e636ab80589bc704cef29bbbbcace05653bd6' 
  AND token = 'MLEA63OG1WIkSQ5hqN4qeODJvqdk7UEKWqLufhCH1RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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