SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f24f51a1f5203009516ecd7b439f4e5636c2473a378c42a3af809cbf1e9b2472' 
  AND token = 'TFaTuwplr5gccKGjLy5GqzywMM7WfDHmAtozX8dKlOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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